Adding the code

hooks.zerotier.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+# This hook copies host zerotier into initramfs
+
+set -e
+
+case "${1:-}" in
+  prereqs)  echo ""; exit 0;;
+esac
+
+ZT_APP=/usr/sbin/zerotier-one
+ZT_CLI=/usr/sbin/zerotier-cli
+ZT_ID=/usr/sbin/zerotier-idtool
+ZTCFG=/var/lib/zerotier-one/
+
+# if ZT not on machine, exit
+if [ ! -f ${ZT_APP} ]; then
+	exit 0
+fi
+
+[ -r /usr/share/initramfs-tools/hook-functions ] || exit 0
+. /usr/share/initramfs-tools/hook-functions
+
+
+copy_exec ${ZT_APP} ${ZT_APP}
+copy_exec ${ZT_CLI} ${ZT_CLI}
+copy_exec ${ZT_ID} ${ZT_ID}
+copy_exec ${ZT_APP} ${ZT_APP}
+mkdir -p ${DESTDIR}/var/lib
+mkdir -p ${DESTDIR}/var/log
+cp -rfpL ${ZTCFG} ${DESTDIR}/${ZTCFG}
+
+manual_add_modules tun

install.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# copy script into initramfs-tools dirs
+echo "Copying files"
+cp hooks.zerotier.sh /usr/share/initramfs-tools/hooks/zerotier
+cp scripts.init-bottom.zerotier.sh /usr/share/initramfs-tools/scripts/init-bottom/zerotier
+cp scripts.init-premount.0zerotier.sh /usr/share/initramfs-tools/scripts/init-premount/0zerotier
+
+# update initramfs to now include our scripts
+echo "Updating initramfs"
+update-initramfs -u

scripts.init-bottom.zerotier.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+PREREQ=""
+
+prereqs() {
+	echo "$PREREQ"
+}
+
+case "$1" in
+	prereqs)
+		prereqs
+		exit 0
+	;;
+esac
+
+. /scripts/functions
+EXE="$(readlink -f /sbin/dropbear)" && [ -f "$EXE" ] || exit 1
+
+
+ZT_APP=/usr/sbin/zerotier-one
+
+# if ZT not on machine, exit
+if [ ! -f ${ZT_APP} ]; then
+	exit 0
+fi
+
+log_msg_begin "Removing loopback device"
+# shutdown lo
+ifconfig lo down
+log_end_msg
+
+log_msg_begin "Removing tun device"
+# remove created tun device
+rm /dev/net/tun
+log_end_msg
+
+log_msg_begin "Stopping ZeroTier"
+kill -TERM $(cat /run/zerotier-one.pid)
+log_end_msg

scripts.init-premount.0zerotier.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+PREREQ="udev"
+
+prereqs() {
+    echo "$PREREQ"
+}
+
+case "$1" in
+    prereqs)
+        prereqs
+        exit 0
+    ;;
+esac
+
+. /scripts/functions
+
+ZT_APP=/usr/sbin/zerotier-one
+
+# if ZT not on machine, exit
+if [ ! -f ${ZT_APP} ]; then
+	exit 0
+fi
+
+# start zerotier if it exists
+[ "$BOOT" != nfs ] || configure_networking
+
+# create tun device file
+mkdir /dev/net
+mknod /dev/net/tun c 10 200
+
+# set up local loopback
+/sbin/ifconfig lo 127.0.0.1
+
+# run zerotier-one
+${ZT_APP} &> /var/log/zerotier.log &
+
+echo $! >/run/zerotier-one.pid